Practice with your camera.

If you have a compact camera or a DSLR. The next link will show you what effect the settings of your camera will have on the picture. Your camera need to have  the following programs. A(perture), S(hutterspeed) or M(anual).

Try it out. It really shows you the effect of shutterspeed and other options.

Camera settings simulator


Shutterspeed:

Aperture:

Try it your self and then PRACTICE yourself.